Rotational analysis of the laser excitation spectra of the bromoacetylene and deuterobromoacetylene cations

1984 ◽  
Vol 62 (12) ◽  
pp. 1437-1451 ◽  
Author(s):  
Michael A. King ◽  
John P. Maier ◽  
Liubomir Misev ◽  
Martin Ochsner
Keyword(s):  
Electronic Structure ◽  
High Resolution ◽  
Laser Excitation ◽  
Neutral Molecule ◽  
Rotational Analysis ◽  
Excitation Spectra

High-resolution laser excitation spectra of the [Formula: see text] bands of the bromo- and deuterobromoacetylene cations have been recorded and rotationally analyzed. The new data are compared with those for the neutral molecule and discussed in terms of electronic structure.

High-resolution laser-excitation spectrum of the A2Π ← X2Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands

1985 ◽  
Vol 63 (7) ◽  
pp. 997-1004 ◽  
Author(s):  
K. Brabaharan ◽  
J. A. Coxon ◽  
A. Brian Yamashita
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Excitation Spectrum ◽  
Laser Excitation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Individual Bands ◽  
Measured Line ◽  
Line Positions ◽  
Π State

The 0–0, 1–1, and 2–2 bands of the A2Π ← X2Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A2Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.

Spectroscopy of metastable species in a free-jet expansion: the β ← A transition in IBr

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1294-1306 ◽  
Author(s):  
Jason O. Clevenger ◽  
Quentin P. Ray ◽  
Joel Tellinghuisen ◽  
Xiaonan Zheng ◽  
Michael C. Heaven
Keyword(s):  
High Resolution ◽  
Laser Irradiation ◽  
Laser Excitation ◽  
Excitation Spectra ◽  
Detailed Characterization ◽  
Free Jet ◽  
X State ◽  
Π State ◽  
Existing Data

The A 1(3Π) state of IBr is observed in a free-jet expansion of IBr in Ar, following photolysis with ArF laser irradiation. Laser excitation spectra are obtained for the β 1(3P2) ← A transition in medium (0.5 cm−1) and high (0.08 cm−1) resolution. Sixteen ν′–ν″ bands recorded in high resolution are rotationally analyzed, providing the first detailed characterization of the lowest three νlevels in the A state. An additional ~50 bandheads in the ν″ = 0 and 1 progressions are recorded for both I79Br and I81Br. The new data, which sample ν′ levels in the range 31–71, are combined with existing information for low ν in the β state to provide improved constants for the β state. These results are merged with least-squares parameters from a detailed reanalysis of existing data for the A and X(1Σ+) states to yield spectroscopic parameters valid for ν = 0–20 in the X state and ν = 0–26 in the A state. Among these results are the first precise estimates of the equilibrium parameters in the A state: Te = 12 369.68 (14) cm−1, ωe = 134.22 (13) cm−1, Be = 0.042 40 (5) cm−1, Re = 2.8583 (16) Å.

Laser-induced fluorescence of MnS: rotational analysis of the A6Σ+ – X6Σ+ transition

1985 ◽  
Vol 63 (11) ◽  
pp. 1380-1388 ◽  
Author(s):  
M. Douay ◽  
B. Pinchemel ◽  
C. Dufour
Keyword(s):  
Laser Excitation ◽  
Band System ◽  
Single Mode ◽  
Laser Induced Fluorescence ◽  
Spin Rotation ◽  
Spin Interaction ◽  
Rotational Analysis ◽  
Excitation Spectra ◽  
High Resolution Spectrometer ◽  
Resolution Spectrometer

Laser-excitation spectra of the rotational structure of the A6Σ+ – X6Σ+ transition of MnS has been performed. The combination of a single-mode dye laser and a high-resolution spectrometer have allowed analysis of a very congested spectrum in which the spin–rotation interaction completely dominates the spin–spin interaction. The (0,1) and (0,3) bands have been analyzed from laser-excitation spectra, and some information has been extracted from the emission spectrum of the (0,0) band. In addition, observation of a second band system confirms results already published by Monjazeb and Mohan.

High-resolution visible spectrum for the A3Π(l)–X1Σ+ system of IBr

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1265-1272 ◽  
Author(s):  
Dominique R. T. Appadoo ◽  
Peter F. Bernath ◽  
Robert J. Le Roy
Keyword(s):  
High Resolution ◽  
Mechanical Behaviour ◽  
Laser Excitation ◽  
Visible Spectrum ◽  
Molecular Constants ◽  
Excitation Spectra ◽  
The Core ◽  
Global Fit ◽  
X State ◽  
Infrared Data

New high-resolution absorption and laser excitation spectra of the A3Π(1)–X1Σ+ system of IBr, consisting of approximately 4000 lines of over 40 bands spanning the vibrational range ν′ = 6–29 and ν″ = 1–4 for each of the two isotopomers, have been recorded and analyzed. Combined with previous microwave and infrared data and fluorescence progressions into the X state, and with new data obtained from laser excitation of the lowest levels of the A state, they formed the core of a global fit to mass-reduced Dunham expansions that yields new molecular constants for the A and X states of I79Br and I81Br. Inability to fully account for all data within the experimental uncertainties points to the existence of substantial perturbations or "non-mechanical" behaviour for A-state levels ν′ > 24.

Sign in / Sign up

Export Citation Format

Share Document